Here is the full list of all 97 Divinity: Original Sin 2 achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Ascend to Divinity
Purge Rivellon of all Source
Share Source with all of Rivellon
Defeated the Kraken
Obtain Anathema
Lohse: Banish your demon
Gain entrance to Lucian's Crypt without following the Path of Blood
Defeat Adramahlihk
Rescue Arhu
Become champion of the Driftwood Arena
Destroy every Voidwoken egg in Reaper's Cove
Receive Dorotya's kiss
Arrive at the Nameless Isle
Pray at every altar on the Nameless Isle
Sebille: Serve the Mother Tree
Discover Reimond's Lair
Arrive at Arx
Enter The Arena of the One
Convince Alexandar to ally with you
Discover the hidden entrance to the Academy
Enter the Academy
Sebille: Kill the Master
Get caught breaking the law
Learn of the Council of Seven's location from The Advocate
Successfully begin a Game Master session
Successfully begin a match in Arena Mode
Take the ferry to Bloodmoon Island
Learn of the Council of Seven's location from a higher power
Unlock your third Source Point slot
Speak to an animal's spirit
Unlock your second Source Point slot
Lockpick your way into Mordus' hidden lair
Meet Meistr Siva
Kill an enemy using Teleportation
Set Gareth on a path of reconciliation
Escape Dallis' siege on the Lady Vengeance after killing every minion
Tame Featherfall
Help free Mari from the Voidwoken
Gain the Hero tag
Arrive at Reaper's Coast
Enter the Hall of Echoes
Escape Dallis' siege on the Lady Vengeance without killing every minion
Take command of the Lady Vengeance
Welcome Tarquin to the Seekers' service
Craft a skill
Shapeshift into every race
Become champion of the Fort Joy arena
Defeat Alexandar in Fort Joy
Rescue Gareth from Braccus' Armoury
Kill Radeka
Equip runes to all of an item's available slots
Craft a grenade
Use your first Source Skill
Face a higher power
Remove your Source Collar
Arrive at the Sanctuary of Amadia
Escort the Black Cat out of Fort Joy
Flee Fort Joy for good
Craft a scroll
Escape the kraken's clutches
Arrive at Reaper's Eye
Perform a successful theft
Win a persuasion event
Force Dallis to retreat from combat in Fort Joy
Kill Slane
Set Gareth on a path of vengeance
Learn of the Council of Seven's location from Malady
Awaken the corrupted Ancestor Tree on Bloodmoon Island
Correctly answer all of Crispin's questions
Escort Saheila outside without fighting the Lone Wolves
Kill Andras, the necromantic dog
Perform successful surgery on Natalie
Serve Garvan the tainted stew
Adopt Peeper
Convince all party members to let you ascend
Swear to the Covenant
Successfully walk the Path of Blood
Submit to the God King
Share Divinity with The Doctor
The Red Prince: Kill the Red Princess
The Red Prince: Become the father of dragons
Lohse: Embrace your demon
Sebille: Destroy the Mother Tree
Fane: Return the Eternals to Rivellon
Fane: Embrace this strange new world
Ifan: Kill Lucian
Ifan: Forgive Lucian
Beast: Assassinate the Queen
Persuade Toyseller Sanders to give you his amulet
Make a deal with Adramahlihk
Beast: Ally with the Queen
Complete the game in Explorer Mode
Complete the game in Classic Mode
Complete the game in Tactician Mode
Use the Curse skill
Gain the Villain tag
Complete the game in Honour Mode